44 GEO. H. HORN, M. D. 



tured and without trace of aiiteiinal depression ; metasternum very coarsely and 

 closely punctured ; abdomen less coarsely and more sparsely punctate, the last 

 segment rugose, the apex not prolonged in a point. Length .14 inch ; 3.5 mm. 



This species differs from all our other species in the absence of pro- 

 longation to the last ventral segment, a character which seems rather 

 of feeble value inasmuch as in penetrans I have observed a gradual 

 diminution of the spine and its almost total obliteration. In other 

 genera species have been admitted with and without the acute ti|) of 

 the last ventral. 



From the table of species as well as by the description this s]iecies 

 seems very closely related to /iHpidanus, which is similar in color and 

 even smaller in size. 



Occurs at Columbus, Texas. 



HYPOC<EL,lTS Esch. 



Form oblong, slightly narrowed posteriorly ; antenna; filiform, not dentate ; 

 head convex, deeply inserted in the thorax ; clypeus narrowed at base, apical 

 margin arcuate ; thorax a little wider than long ; elytra striate, their spaces ob- 

 tuse ; prosternal sutures straight, divergent, propleural triangle but little longer 

 than wide and with a slight anteianal depression in front ; metathoracic epistcrna 

 parallel, the epimera not visible ; hind coxal plates dilated within ; last ventral 

 segment very obtuse at tip; legs moderate, tarsi filiform, the first joint of the 

 posterior pair as long as the next three, the fourth not dilated nor lobed beneath : 

 claws slender. 



Hypocoelus is very closely related t<) Nematodes, and is distin- 

 guished by the simple fourth tarsal joint and the very obtuse termi- 

 nal ventral segment. 



Two species are known in our fauna, separated as follows : 



Terminal joint of the antennse very little longer than the preceding ; a distinct 

 transverse ridge on the front, clypeus concave fi'ontosu!^. 



Terminal joint of the antennje longer than the preceding, in the % as long as 

 the ninth and tenth together ; front with a fine longitudinal carina, clypeus 

 flat tei'iniiiali!^. 



H. froiitONUS Say. — Form oblong, slightly attenuate posteriorly, piceous 

 black, sulxipaque, clothed with fine yellowish cinereous pubescence ; antennae 

 ferruginous, shorter than half the body, filiform, second joint shorter than the 

 fourth, third longer, joints four to ten very gradually longer and slightly broader, 

 eleventh oval, acute at tip, very little longer than the tenth ; head densely and 

 rather roughly punctate, front with a distinct, transverse, slightly arcuate carina, 

 beneath the front is slightly concave ; clypeus concave, narrower at base than 

 the distance to the eyes ; prothorax a little wider than long, slightly narrower in 

 front, sides straight and slightly convergent posteriorly, slightly arcuate at apical 

 thii-d, hind angles acvite, not carinate, lateral margin entire ; disc convex, me- 

 dian line distinctly impressed in its entire length and on each side in front of 



